摘要
普遍认为变暖有利于高山植被生态系统,并已经导致冰缘植物向高海拔的扩张.珠峰山谷金字塔气象站(海拔5050 m)1994~2018的气象记录显示,高海拔山区呈显著的暖干化趋势.然而,我们依然不清楚暖干化是否对冰缘植被更新和分布造成显著影响?本研究在喜马拉雅山中段3个山谷建立了8块(30 m×120 m)滇藏方枝柏(Juniperus indica)和高山柏(Juniperus squamata)灌木线样地(海拔介于4344~5074 m之间).样地调查揭示,自20世纪90年代之前所有样地种群更新呈增加的趋势,然而90年代以来更新持续下降.种群更新与春季、夏季温度之间呈现显著的负相关关系,暗示了暖干化加剧了水分胁迫,并限制了种群的更新.另外,近60年来所有灌木线位置稳定.近30年遥感数据也证实,研究区冰缘植被无变绿趋势,甚至出现2%-6%的植被生长减弱现象.因此,进一步研究应该探讨冰缘植被生长减弱对喜马拉雅山区水循环和生物多样性的影响.
作者
Shalik Ram Sigdel
Jayram Pandey
梁尔源
Sher Muhammad
Flurin Babst
Steven W.Leavitt
沈妙根
朱海峰
Franco Salerno
朴世龙
J.Julio Camarero
Josep Penuelas
Shalik Ram Sigdel;Jayram Pandey;Eryuan Liang;Sher Muhammad;Flurin Babst;Steven W.Leavitt;Miaogen Shen;Haifeng Zhu;Franco Salerno;Shilong Piao;J.Julio Camarero;Josep Penuelas(State Key Laboratory of Tibetan Plateau Earth System,Resources and Environment(TPESRE),Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China;University of Chinese Academy of Sciences,Beijing 100049,China;International Centre for Integrated Mountain Development(ICIMOD),Kathmandu,Nepal;Institute of International Rivers and Eco-security,Yunnan University,Kunming 650500,China;School of Natural Resources and the Environment,University of Arizona,Tucson,AZ 85721,USA;Laboratory of Tree-Ring Research,University of Arizona,AZ 85721,USA;Water Research Institute-National Research Council(IRSA-CNR),Brugherio 20861,Italy;Instituto Pirenaico de Ecología(IPE-CSIC),Zaragoza 50080,Spain;CSIC,Global Ecology Unit CREAF-CSIC-UAB,Cerdanyola del Valles,Catalonia 08913,Spain;CREAF,Cerdanyola del Valles,Catalonia 08913,Spain)
基金
supported by the National Natural Science Foundation of China(42030508,41988101)
the Second Tibetan Plateau Scientific Expedition and Research Program(STEP)(2019QZKK0301)
funding from the European Research Council(ERC-SyG-2013-610028 IMBALANCE-P)
funding from the project “Inside out”(#POIR.04.04.00-00-5F85/18-00)funded by the HOMING programme of the Foundation for Polish Science co-financed by the European Union under the European Regional Development Fund。
